JPH06331363A - Vibration gyroscope - Google Patents

Abstract

PURPOSE:To obtain a vibration gyroscope which is limited in external effect, breakage by external impact, leakage of vibration and transmission of external vibration. CONSTITUTION:Support members 24a and 24b of a vibrator 12 are soldered on mounting base plates 26a and 26b. First and second regulation members 32 and 34 are arranged near a vibration body 14 of the vibrator 12. The mounting base plates 26a and 26b are mounted on a stem 40 through a buffer material 38. A terminal 50 piercing the stem 40 is connected to a piezo-electric element 16b of the vibrator 12 with a lead. A cap 52 is provided to cover the vibrator 12 or the like. The stem 40 and the cap 52 are welded to close the vibrator 12 or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration gyro,
Particularly, for example, it relates to a vibration gyro used for preventing a camera shake of a navigation system of an automobile or a video camera.

[0002]

2. Description of the Related Art FIG. 3 is a perspective view showing an example of a conventional vibrating gyro, and FIG. 4 is a sectional view thereof. The vibrating gyro 1 includes a vibrating body 2 having a regular triangular prism shape. Vibrator 2 of 3
The piezoelectric elements 3a, 3b, and
3c is formed. Further, support members 4a and 4b are attached to the ridge portion near the node points of the vibrating body 2. The support members 4a and 4b are formed, for example, by bending a metal wire into a U-shape. These support members 4 a and 4 b are attached to the support plate 5.

In this vibrating gyro 1, the piezoelectric elements 3a,
An oscillation circuit is connected between 3b and the piezoelectric element 3c. The piezoelectric elements 3a, 3b, 3c and the oscillation circuit are connected by lead wires. The oscillator 2 flexurally vibrates in a direction orthogonal to the surface on which the piezoelectric element 3c is formed by a signal from the oscillation circuit. When rotating around the axis of the vibrating body 2 in this state, the vibration direction of the vibrating body 2 changes due to the Coriolis force. Therefore, a difference occurs between the signals generated in the piezoelectric elements 3a and 3b, and by measuring the difference between the output signals,
The rotational angular velocity can be detected.

[0004]

However, in such a vibrating gyroscope, since the vibrator is always in contact with the outside air, it is easily affected by changes in characteristics due to changes in temperature and humidity. Moreover, since the supporting member is formed of a thin metal wire or the like, when the vibrating body vibrates greatly due to an external impact or the like, plastic deformation such as bending of the supporting member occurs. Furthermore, since the connection between the piezoelectric element and the circuit is performed by laying around the lead wire, the vibration of the vibrating body may leak from the lead wire, or the vibration from the outside may be transmitted from the lead wire to the vibrating body and affect it. There is.

Therefore, a main object of the present invention is to provide a vibrating gyro that is less influenced by the outside, less damaged by an impact from the outside, and has less vibration leakage and transmission of external vibration.

[0006]

According to the present invention, there is provided a vibrator having a columnar vibrating body, and a stop member arranged near the vibrating body for suppressing the vibration of the vibrating body due to an impact from the outside. A vibrating gyro that includes a case for accommodating and sealing a vibrator and a stopping member, and a terminal formed to penetrate the case and electrically connected to the vibrator.

[0007]

[Function] The vibrator is shielded from the outside by the case.
Moreover, the range in which the vibrating body shakes is limited by the restraining member. Furthermore, since the vibrator and the terminal are electrically connected inside the case, the external circuit and the vibrator can be connected via the terminal, and a long lead wire is not required.

[0008]

According to the present invention, since the vibrator is shielded from the outside, it is difficult to be affected by temperature and humidity and stable characteristics can be obtained. Further, since the range in which the vibrating body vibrates is limited, it is possible to prevent damage to the vibrating gyro due to the vibrating body moving due to an external impact. Furthermore, it is not necessary to run long lead wires,
It is possible to prevent the vibration of the vibrator from leaking, and to prevent external vibration from affecting the vibrator via the lead wire.

The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the drawings.

[0010]

1 is an exploded perspective view showing an embodiment of the present invention. The vibrating gyro 10 includes a vibrator 12. The vibrator 12 is, for example, a vibrating body 14 formed in a regular triangular prism shape.
including. The vibrating body 14 is formed of a material that generally causes mechanical vibration, such as elinvar, iron-nickel alloy, quartz, glass, crystal, or ceramic.

As shown in FIG. 2, piezoelectric elements 16a, 16b, 1 are provided at the central portions of the three side surfaces of the vibrating body 14, respectively.
6c is formed. The piezoelectric element 16a includes a piezoelectric layer 18a made of, for example, piezoelectric ceramic. Electrodes 20a and 22a are formed on both surfaces of the piezoelectric layer 18a.
Then, the one electrode 22a is bonded to the side surface of the vibrating body 14. Similarly, the piezoelectric elements 16b and 16c are the piezoelectric layers 18
b, 18c, and electrodes 20b, 22b and electrodes 20c, 22c are formed on both surfaces thereof. Then, one of the electrodes 22b, 22c of the piezoelectric elements 16b, 16c is
Are bonded to the side surface of the vibrating body 14.

At the ridgeline near the node of the vibrating body 14,
The support members 24a and 24b are attached. Support member 2
4a and 24b are formed, for example, by bending a metal wire into a U-shape. These support members 24a, 2
The central part of 4b is made into a vibrating body 1 by welding or the like.
It is attached to the ridge part of 2. And the support member 24
The ends of a and 24b are attached to the mounting boards 26a and 2b, respectively.
It is fixed to 6b.

The mounting substrates 26a and 26b are made of an insulating material and are formed into a rectangular plate shape. A plurality of holes 28 are formed in the one mounting substrate 26a, and a metal layer is formed around and inside the holes 28. A plurality of holes 30 are also formed in the other mounting substrate 26b, and a metal layer is formed around and around the holes 30. One support member 24a is inserted into the hole 28 of the mounting substrate 26a and soldered to the metal layer formed in the hole 28. The other supporting member 24b is attached to the mounting substrate 26.
It is inserted into the hole 30 of b and is soldered to the metal layer formed in the hole 30.

In the vicinity of the vibrating body 14, the first stopping member 3
2 and the second stop member 34 are attached. The 1st stop member 32 is attached to the attachment boards 26a and 26b one by one. The first stopping member 32 is formed of, for example, a metal plate, and is formed in a substantially U shape. Then, between the two support members 24a and 24b, they are arranged on both sides and below in the width direction of the vibrating body 14 with a space therebetween. First
Two protrusions are formed on the restraining member 32 of, and the protrusions are formed in the hole 28 of the mounting substrate 26a and the mounting substrate 2
6b is inserted in the hole 30. And those holes 28,
Soldered to the metal layer formed on 30.

The second restraining members 34 are arranged at both ends of the vibrating body 14 in the longitudinal direction with a space. The second stop member 34 includes two side members 34 a arranged on the side portion of the vibrating body 14. The side member 34a includes the piezoelectric elements 16a and 16a.
It has an oblique wall surface along the side surface of the vibrating body 14 in which b is formed, and extends from the oblique wall surface in the mounting substrate 26a, 26b direction. Then, the mounting boards 26a and 26b
A bent portion 34b for fixing to is formed. The two side members 34a are connected by a connecting plate 34c. This connecting plate 34c is provided at both ends of the vibrating body 14 in the longitudinal direction of the vibrating body 1.
It is arranged at a distance from 4. The second stop member 34 is
The mounting boards 26a, 2 are made of, for example, metal.
6b is soldered. The mounting board 26a,
A metal layer 36 for soldering the second restraint member 34 is formed on 26b.

The two mounting boards 26a and 26b are provided with a cushioning member 38 and a stem 40 forming a part of the case.
Attached to. As the cushioning material 38, an adhesive material such as silicone foam is used. A quadrangular through hole 42 is formed in the center of the cushioning material 38, and the two mounting boards 2 are provided on both sides of the through hole 42.
6a and 26b are arranged. Further, the cushioning material 38 includes
A plurality of holes 44 for inserting terminals described later are formed.

The stem 40 is formed in a rectangular plate shape, for example, and the fixing plates 46 are formed on both sides in the width direction thereof. The fixing plate 46 is formed with a hole 48 for attaching the stem 40 to another substrate or the like with a screw or the like. In addition, stem 4
A plurality of terminals 50 are formed so as to pass through 0. The terminal 50 penetrates the hole 44 of the cushioning material 38 and the hole 28 of the mounting substrate 26a and is exposed to the vibrator 12 side. These terminals 50 and the piezoelectric element 16a of the vibrator 12,
16b and 16c are connected by a lead wire (not shown).

Further, the vibrator 12, the stopping members 32, 3
4, a box-shaped cap 52 is covered so as to cover the mounting substrates 26a and 26b, the cushioning material 38, and the like.
The cap 52 is welded to the stem 40 to seal the vibrator 12 and the like. Thus, the stem 40 and the cap 52
A case is formed by.

To use this vibrating gyro 10, an oscillation circuit is connected between the piezoelectric elements 16a and 16b and the piezoelectric element 16c. By the signal from this oscillation circuit,
The vibrating body 14 flexurally vibrates in a direction orthogonal to the surface on which the piezoelectric element 16c is formed. At this time, the piezoelectric element 16a and the piezoelectric element 1
The output signals obtained from 6b are the same and are 0 when the difference between the output signals is measured. When the vibrating body 14 is rotated about its axis, the Coriolis force changes the vibrating direction, which causes a difference in the output signals of the piezoelectric elements 16a and 16b.
Therefore, the rotational angular velocity can be detected by measuring the difference between the output signals of the piezoelectric elements 16a and 16b.

In this vibrating gyro 10, the vibrator 12 is hermetically sealed in the case formed by the stem 40 and the cap 52, so that it is hardly affected by changes in the external environment such as temperature and humidity. Therefore, the deterioration of the characteristics due to the change of the external environment can be reduced. In addition, the vibrating body 14
Around the circumference of the first stop member 32 and the second stop member 34
The vibrating body 14 does not move significantly even if an external impact is applied. Therefore, it is possible to prevent plastic deformation such as bending of the support members 24a and 24b due to an external impact.

Further, since the oscillation circuit for driving the vibrator 12 and the detection circuit for detecting the rotational angular velocity are connected to the vibrator 12 via the terminal 50 penetrating the stem 40, the lead wire is not used. There is no need to run around for a long time. Therefore, it is possible to prevent the vibration of the vibrating body 14 from leaking from the lead wire, and also to prevent the external vibration from being transmitted to the vibrator 12 via the lead wire. Therefore, stable vibration can be obtained, and a vibration gyro with excellent characteristics can be obtained.

In the above-mentioned embodiment, the supporting member, the stopping member, the terminal, the cap and the like are fixed by soldering or welding, but they may be fixed by another method such as using an adhesive. Further, the vibrating body 14 may be formed in another columnar shape such as a quadrangular prismatic shape or a cylindrical shape. Further, a vibrator in which the vibrating body 14 is formed of a piezoelectric body and electrodes are formed on the side surfaces of the vibrating body 14 may be used.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a vibrator used in the vibrating gyro shown in FIG.

FIG. 3 is a perspective view showing an example of a conventional vibrating gyro.

4 is a cross-sectional view of the conventional vibrating gyro shown in FIG.

[Explanation of reference numerals] 10 vibrating gyro 12 vibrator 14 vibrating body 24a, 24b support member 26a, 26b mounting substrate 32 first blocking member 34 second blocking member 38 cushioning material 40 stem 50 terminal 52 cap

Front page continuation (72) Inventor Yoshinobu Yoshinouchi, Yoshioka, Nagaokakyo, Kyoto Prefecture 2 26-10 Tenjin Co., Ltd. Murata Manufacturing Co., Ltd. (72) Inventor, Kiyoshi Iwai 2 26-10 Tenjin, Nagaokakyo, Kyoto Stock Murata Manufacturing Co., Ltd.

Claims (1)

[Claims] 1. A vibrator having a columnar vibrating body, a restraining member arranged near the vibrating body for suppressing vibration of the vibrating body due to an external impact, and the vibrating body and the restraining member are housed. And a case for hermetically sealing, and a terminal formed to penetrate the case and electrically connected to the vibrator.